Dr. Sc. Jose Miguel Costa Requena
My history
I graduated as M.Sc.(Eng.) from the
Polytechnic University of Valencia (UPV) -SPAIN- on March 1999
I have been working:
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1994 |
Research
Assistant |
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1996 |
System
Planning Researcher |
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1998 |
Researcher
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My interest areas
- Internet
- Future
technologies of the Internet and IP switching.
- Signaling
& Routing protocols of the Internet (H323, SIP, ...).
- Internet
Telephony, PSTN-IP Gateways.
- New
Services in Internet and Directories Technology for future Services.
- Mobile telecommunication networks
- Network architecture,
signaling, services.
- WCDMA, 3rd generation.
- Software in Telecommunications
- Project
managers for Protocol Software Design and Data SW development.
- Software
development for IP Routing Protocols.
- Software
R&D Project Managers.
Background of the IPANA project
The wide and ever-growing usage of Internet and the
birth of new Internet applications ( e.g. telephony and video conference )
requires a smooth transition to network components providing both the old and
new services. This has caused development of new label swapping protocols
for Internet routing, to make it possible to use broadband technologies
like the ATM in the transmission level.
Several solutions to do
this task have been suggested by different parties e.g. Classical IP over
ATM, ATM Forum LAN Emulation and ATM Forum Multiprotocol Over ATM (MPOA).
IPSILON Inc. introduced in
the spring of 1996 the concept of IP switching, where the
functionality of internet routers and ATM switches was combined.
After Ipsilon Inc. have
several other parties proposed their own versions including CISCO's Tag
Switching, IBM's Aggregate Route-Based IP Switching
(ARIS), Juha Heinänen's Switching IP Through ATM (SITA),
Toshiba's Cell Switch Router (CSR) and the
MPLS-workgroup's Multiprotocol Label Swapping (MPLS). As
the latest one is there now coming Augmented IP Protocol (AIRP).
All of those technologies are usually called the IP swapping, and their
basic technical ideas are also compared.
The basic idea behind the
IP switching is to reduce the workload of the router by switching long-lived
data flows, containing relatively large amounts of data, to separate
ATM-connections. This concept is rather simple, but contains also several
challenging issues to be solved, e.g. Quality of Service, CAC and resource allocation.
Especially in my topic, implementation and optimization of a large IP
switched network opens a huge problem area.
Research done in theIPANA project
A lot of preliminary studies, theses and articles have
been made in the IPANA project before I come to it, and I may refer to the
respective pages and articles of my colleagues.
We also have in our lab a working research network, which is implemented by
using IPSILON technology. There are also multimedia traffic sources and
the measurement equipment's available in the research network.
I have been working unto
now with my Master Thesis "An Implementation of the Server Cache
Synchronisation Protocol (SCSP)"
MASTER THESIS
My Master Thesis is titled "An Implementation
of the Server Cache Synchronisation Protocol (SCSP) ".
Initially, the SCSP algorithm establishes the data synchronisation
among a set of server entities of a particular protocol which are bound to a
Server Group (SG). After that it maintains an actively mirroring state of any
change in every cache information that form the SG.
The program implemented is
based on an object-oriented software environment. This leads to a modular
implementation. Different processes take place between each "Local
Server" (LS) and its "Direct Connected Server" (DCS). The
protocol code (which is written in C++) facilitates an easy translation to new
communication architectures and services in a rapidly changing scenario. In
that way the platform-dependence was minimised using the software functions
provided by Free Software Foundation, GNU". UNIX, is the operating system
chosen for the software development. UNIX provides enough speed to the protocol
performance in those situations where the data replication is important for the
system which is using the SCSP.
The basic structures used
by the program were developed following the Management Information Base (MIB) specifications. The purpose is to
permit later interactions with an SNMP agent, which checks the correct
functioning of the protocol.
The most important application
of this software package is focused in the IP Telephony and the new emerging
directory services. For those services it is necessary to manage large amounts
of information that is stored in distributed databases that need to be
efficiently updated and replicated.
PUBLICATIONS
MASTER'S THESIS
· Implementation of the Internet Call
Waiting Service using SIP Raimo Kantola, Jose Costa and Inmaculada
Espigares. Pdf
· A Scalability Analysis of the Server Cache
Synchronization Protocol (SCSP) Raimo Katola, Jose Costa and Julio
Yebebnes. Pdf
· Security and auto-congiguration of
Location Servers for IP Telephony Raimo Kantola, Jose Costa and Ignacio
Gonzalez Olias. Pdf
· Scalability Analysis of ENUM for IP
Telephony Routing Raimo Kantola, Jose Costa and Xiaoling Zhen.
PUBLISHED
Abstracts of
following papers are stored with other papers from this project.
Full papers are either in PostScript or PDF form.
CONFERENCES
ACCEPTED
· R Kantola and J M Costa Requena: "The Server Cache Synchronization
Protocol - a component for Directory Enabled Networks", accepted to SPIE
VVD'99 Presentation slides
I. Espigares, R Kantola and
J M Costa Requena: "New tools for Programming IP Telephony services",
The first IP Telephony Workshop, Berlin, April 2000. Conference
R Kantola, J M Costa
Requena and Nicklas Beijar:"An Architecture for an SCN/IP Telephony
routing testbed", presented at The first IP Telephony Workshop, Berlin,
April 2000. Conference
R Kantola, J M Costa
Requena and Nicklas Beijar:"A Common Numbering Infrastructure for IN and
IP Telephony", presented at IN2000, Cape Town, South Africa, May 2000. Conference
R Kantola, J M Costa
Requena and Nicklas Beijar:"SIP 200 beyond H.323" Paris, 08.05.200-
12.05.200. Paper
H Tang and J Costa Requena:
"Serving Spatial Location over Internet". Proceedings of the ACM 2nd
International Conference on Mobile Data Management, Springer, pp.246-251, Jan.
2001.
J Costa Requena and I
Espigares: "Security concerns in 3G networks", The Internet and
Multimedia Systems and Applications (IMSA2001). proceedings of the IASTED
International Conference, pp 91-95, August 2001. Conference
J Costa Requena and I
Espigares: "Identifying security gaps in 3G", Paris IPSEC, October
2001. Conference
J Costa Requena and H
Tang:"Enable SIP with Spatial Location for Emergency Call
Services",IEEE ICCCN2001, October 2001. Conference
JOURNALS
R Kantola, Jose Costa
Requena, Nicklas Beijar: "Interoperable routing for IN and IP
Telephony", Computer Networks Journal.
J Costa Requena and H
Tang:"Application of Spatial Location Information to SIP", The
Journal of Networks, Software and Applications. Issue
IETF Drafts
"Spatial Location
Protocol Requirements", Draft(expired)
"Basic SloP
Architecture Proposal" , Draft(expired)
"Target Naming Scheme",
Draft(expired)
"Mapping of Basic and
Digest Authentication to DIAMETER AAA Messages", Draft
SUBMITTED
FUTURE RESEARCH
Actual Research in our
Laboratory is focused in the Interoperability between GSTN and IP
· Gateway Location Protocol or Telephony
Routing over IP implementation using Python and MySQL. Raimo
Kantola,Jose Costa and Juho Haapala. Presentation slides
· Implementation of new services using SIP
and XML. Raimo Kantola, Jose Costa and Inmaculada Espigares.
· Interoperability between GSTN and IP.
Implementation of the Number Portability Routing Protocol. Raimo Katola, Jose Costa and
Nicklas Beijar.
In the case you would like to get more information about my study,
or you have any comments or questions to it, please send
me a message. I would be very grateful.
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Tämän
sivun sisällöstä vastaavat webmaster@keskus.hut.fi,
Jose M Costa
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